A Natural Epizootic of Infectious Hematopoietic Necrosis in Fry of Sockeye Salmon (Oncorhynchus nerka) at Chilko Lake, British Columbia
- 1 July 1976
- journal article
- research article
- Published by Canadian Science Publishing in Journal of the Fisheries Research Board of Canada
- Vol. 33 (7) , 1564-1567
- https://doi.org/10.1139/f76-196
Abstract
The first confirmed epizootic of infectious hematopoietic necrosis virus disease under natural conditions is reported for sockeye salmon, Oncorhynchus nerka, in Chilko Lake, British Columbia. The outbreak occurred among fish of the 1972 brood during the spring of 1973. An estimated 825.6 million eggs were deposited in the Chilko River in 1972, and the production of 31.4 million fry that migrated into the lake in 1973 was significantly lower than the 55.1 million fry expected. The egg-to-fry survival of 3.8% was the lowest ever recorded at Chilko Lake (1949–73). The estimated fry-to-smolt survival of 57.1%, however, was well within the normal range for this lake. Apparently IHN severely reduced the survival of the 1972 brood of sockeye salmon fry at Chilko Lake, and all or nearly all of the reduction occurred during the egg-to-fry stage of the life cycle.This publication has 1 reference indexed in Scilit:
- Infectious Hematopoietic Necrosis Virus: Prevalence in Certain Alaskan Sockeye Salmon, Oncorhynchus nerkaJournal of the Fisheries Research Board of Canada, 1976